When most people hear the word casino, they picture one of the megaresorts in Las Vegas—a massive hotel and entertainment complex blazing with neon lights, fun, and games. But Merriam-Webster’s definition of a casino is much broader than that of the typical American: “a building or room used for social amusement, specifically gambling.”

Most casinos are designed to entice patrons into wagering their money by offering a variety of games of chance and skill and by providing a comfortable environment in which to do so. They typically offer free drinks and food, and may also feature live performances by popular musicians or comedy performers. Some casinos are run by private companies, while others are owned and operated by states, local governments, or Native American tribes.

In 2008, according to the Gallup Organization, 24% of poll respondents reported visiting a casino. This is up substantially from the 20% reported in 1989.

Casinos strive to keep their gambling profits high by ensuring that gamblers remain as long as possible in their facilities, and by offering them generous inducements. In addition to the obvious perks of free spectacular entertainment and elegant living quarters, many casinos also provide complimentary transportation and free drinks while gambling.

Gamblers can earn additional perks by joining casinos’ loyalty or comp programs, which reward frequent players with free meals and other prizes. The programs also give the casinos a database of their users, which can be used to target them with mailings and other marketing activities.